Mechanical Installation Of External Brake Resistors; Electrical Installation; Checking The Insulation Of The Assembly; Connection Diagram - ABB ACS880-07XT Series Hardware Manual

164 Resistor braking

Mechanical installation of external brake resistors

All brake resistors must be installed outside the drive. Obey the resistor manufacturer's
instructions.

Electrical installation

Checking the insulation of the assembly


Obey the instructions given in section

Connection diagram


See section Connection

Connection procedure


•
Connect the resistor cables to the R+ and R- terminals in the same way as the other
power cables. If a shielded three-conductor cable is used, cut the third conductor and
ground the twisted shield of the cable (protective earth conductor of the resistor
assembly) at both ends.
•
Connect the thermal switch of the brake resistor as described in section
system against thermal

Start-up

Set the following parameters (ACS880 primary control program):
•
Disable the overvoltage control of the drive by parameter 30.30 Overvoltage control.
•
Set parameter 31.01 External event 1 source to point to the digital input where the
thermal switch of the brake resistor is wired.
•
Set parameter 31.02 External event 1 type to Fault.
•
Enable the brake chopper by parameter 43.06 Brake chopper enable. If Enabled
with thermal model is selected, set also the brake resistor overload protection
parameters 43.08 and 43.09 according to the application.
•
Check the resistance value of parameter 43.10 Brake resistance.
With these parameter settings, the drive stops by coasting at brake resistor
overtemperature. For settings of other control programs, see the appropriate firmware
manual.
WARNING! If the drive is equipped with a brake chopper but the chopper is not
enabled by the parameter setting, the internal thermal protection of the drive
against resistor overheating is not in use. In this case, the brake resistor must be
disconnected.
Note: Some brake resistors are coated with oil film for protection. At the start-up, the
coating burns off and produces a little bit of smoke. Ensure proper ventilation at the start-
up.
Brake resistor and resistor
diagram.
overload.
cable.
Protecting the